Jolt and draw foundry machine



Sept. 22, 1953 l.. c. YOUNG 2,652,607

JOLT AND DRAW FOUNDRY MACHNE A Filed April 24, 1952 2 Sheets-Sheet l Sept. 22, 1953 L. c. YOUNG 2,652,607

JOLT AND DRAW FOUNDRY MACHINE Filed April 24, 1952 2 Sheets-Sheet 2 LESTER G. YOU/VG Patented Sept. 22, 1953 OFFICE J OLT AND DRAW FOUNDRY MACHINE Lester C. Young, Cleveland, Ohio, assigner to Spc, Inc., a corporation of (lhio Application April 24, 1952, Serial No. 284,007

(Cl. ,Z2-26) 3 Claims.

This invention relates to molding machines, and 'more particularly to jolt molding machines adapted to aid in compacting the molding sand or other material.

This application is a continuation-impart of my prior application, Serial No. 105,554, now 'Patent No. 2,601,656.

In jolt molding machines, the jolt table is raised by a fiuid pressure lifting means which 'comprises a piston element and a cylinder element adapted to be extended relative to each other and defining an extensible fluid pressure chamber. For the raising movement of the jolt table, fluid under pressure is introduced into the extensible fluid pressure chamber to raise the jolt table relative to an anvil upon which the `jolt table rests in its lowermost position. In operation, the jolt table is raised a predetermined distance above the anvil, and then the iuid is exhausted from the fluid lifting cham- 'i ber, which permits the jolt table to fall by gravity and strike the anvil for producing a jolting operation to aid in compacting the molding sand or other material in the melding flask or other container. In prior constructions, as the piston and cylinder move extensively relative to each other for raising the jolt table, there is an exposure of the relative movable portion of the piston. This exposed portion of the piston is normally subjected to a considerable amount of molding sand or other foreign abrasive materials which come in contact therewith during the jolting operations of the molding sand and which, if not prevented, cause a great deal of excessive wear. My Patent No. 2,456,663 teaches a construction which will protect such exposed portion. rlhis invention provides a combination of piston and cylinder combinations to produce a jolting action and a continuous movement for squeezing. This invention incorporates al1 of the advantages shown by my prior patent, and in addition thereto provides for one piston and cylinder combination which is totally enclosed, and therefore shielded from all abrasive action of room dirt.

An object of this invention is to provide a jolt machine construction which encloses the relatively movable Wall surfaces of the lifting means during the jolting operations.

Another object of this invention is to effectively combine a jolt and squeeze action together in one foundry machine.

Another object of this invention is to provide a two-directional piston and cylinder construction for jolting a .table when the .table is up- 2 right, and for pulling the table to the base and holding it against the base when inverted.

Another object of this invention is to provide spaced guide surfaces acting between the relatively movable members of a jolt machine, to provide smooth jolt movement and prevent galloping action.

Still another object of this invention is to provide a jolt machine construction which can tolerate a large amount of wear between the relatively movable parts, and yet have a smooth, non-galloping jolt action.

Other objects and a fuller` understanding of the invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawings, in which:

Figure 1 is a transverse cross-sectional view of a jolt molding machine base unit employing the features of this invention;

Figure 2 is a sectional View similar to Figure 1 of a modification of the base unit employing the features of this invention;

Figure 3 is a broken away sectional view taken at a angle with respect to Figure 2 illustrating the air intake lines into the extensible chamber of the embodiment illustrated in Figure 2;

Figure 4 is a type of foundry equipment machine into which the base units of Figures 1 `and 2 may be incorporated, the machine being of the roll-over type; and

Figure 5 is a stationary oor type of foundry machine into which either of the base units of Figures 1 or 2 may be built.

With reference to the Figure 1 of the ldrawing, my jolt machine comprises generally a base I6, a jolt table 213, a fluid pressure lifting mechanism comprising a piston i8 and a cylinder 29 interposed between the base l El and the jolt table 24, and an outer tubular shell H projecting upwardly from the base and terminating in an anvil l2 against which the jolt table strikes to aid in compacting the molding sand or other materials.

The base I0 may be of any suitable shape and has a relatively at bottom adapted to rest upon a suitable foundation. The outer tubular shell Il projects upwardly with respect to the base i6 and serves not only as an anvil against which the jolt table gli may strike, but also has the protecting shield to prevent molding sand or other foreign abrasive substances from coming into the interior of the machine. The upper end of the anvil I2 is provided with a flat annular face i3 against which the jolt table strikes.

In the basic unit illustrated in Figure 1 of the drawings, the cylinder 29 is the inner portion of a central core member I4. The core I4 has an annular Wall I5 defining a stationary piston mounted upon the base I 3.

The jolt table 24 is preferably constructed of a semi-steel casting and is disposed to rest upon the anvil i2 of the upper end of the tubular shell Il in substantially a horizontal position. The jolt table 24 has preferably a flat upper surface 25 and has upon its underneath side three annular depending flanges or ribs to reinforce the construction; namely, an outer flange 26, an intermediate flange 21 and a central flange which constitutes a cylinder i6. This construction, and the action between the piston wall I5 and the cylinder I 6, is similar to that set forth in Patent No. 2,456,663. The outer ange 26 extends downwardly from the marginal edge of the jolt table.

The flange 21 projects downwardly at an inter- "i mediate radial annular location and constitutes a hammer for striking the anvil. The flanges are preferably integrally formed with the jolt table and aid in reinforcing the jolt table Whereby it may withstand the heavy shocks to which it is subjected during the jolting operation. The annular flange or extension 21, is substantially in alignment with the anvil I2 and is provided with a flat annular face 28 adapted to strike anvil I2 to effect compacting of the molding sand I" or other material. rEhe cylinder wall i6 is preferably integrally connected to the underneath side of the jolt table 24 and constitutes a reinforcing annular rib or extension for the jolt table. It is to be noted that the three anges, sepwhich would otherwise occur if the cylinder end i were used as a hammer.

The core I4 is closed across the top Yby wall I1, and the wall I1, coacting with the area of the table 24 within the cylinder wall I6, defines an extensible chamber I5 adapted to receive uid under pressure. Thus, uid may be supplied to and exhausted from the chamber i9 .through a convenient line 20 and the table 24 may be raised with respect to the core I4. Chamber i9 is ernployed in the illustrated embodiment of the invention as a squeeze chamber to push the table 24 steadily upward with a constantforce. This action is employed in many types of foundry machinery, such, for example, as the machines illustrated in Figures 4 and 5, wherein a foundry mold is squeezed between jolt table 24 and hook arms 2|, The described squeeze action is separate from the jolt action heretofore referred to, but when the chamber I9 is not in service for squeezing, the piston walls I5 and the cylinder walls I6 serve as guide means to aid in assurlng proper vertical reciprocating motion of the table 24 during jolting operation.

In the embodiment ofthe invention as illustrated in Figure 1, the cylinder 26 is a part of the core I4, and is stationary with respect to the base I6. The piston I8 is adapted to reciprocate vertically within the cylinder 29. A piston rod 22 extends through an opening 23 in the ton wall fl. I)

I1, and is secured by any suitable means, such, for example, as by the nut 36, to the table 24. In the preferred embodiment, it is preferable to provide a large opening 23 and place a packing 3i and a guide bushing 54 therein in order that fluid pressure may be introduced between piston I6 and wall I1 for return of the table 2li w en the unit is used in a roll-over-draw machine.

In order to introduce a compressed uid into the chamber A in Figure 1, a connecting series of conduits 31A are drilled into the casting and lead to the chamber A. A conventional flexible hose and valve is attached to the conduits 31A in the usual well-known manner.

The cylinder 29 is closed at the bottom by exhaust plate 32 which is more fully set forth and explained in the application for Control for jarring mechanism in foundry machine, Serial No. 105,553, now Patent 2,619,695. The exhaust plate 32 has a variable exhaust line 33 adapted to conduct exhaust-fluid Linder pressure to exhaust port 34 leading into a chamber 35 formed within the shell II. Thus, exhaust fluid will exit from the machine between the flat face I3 and the flat face 26 on the members II and 24, respectively, blow room dust outwardly away from the machine.

The exhaust plate 32, 'and the piston I8 define an extensible jolt chamber 36. Fluid under pressure is introduced-into the extensible chamber 35 through means of a connecting series of conduits 31 suitably provided in the well-known manner,

When the jolt table 24 is resting upon the anvil I2, a valve rod 38 lcloses the exhaust line 33, and an intake port 39 through the side wall of the piston I3 connects the conduits 31 into the chamber 36.y Thus, the chamber 36 is closed against exhaust, and is supplied from a suitable source of fluid pressure through a regulating systeni of valves all illustrated diagrammatically by the control assembly 40.

In operation, the fluid under pressure enters into the chamber 36 until sufficient pressure is built up to push the piston I8 and the rod 22 upwardly and move the table 24 olf of the anvil I2. When the piston I8 moves upwardly, however, the valve rod 38 is pulled out of the exhaust line 33 and the pressure within the cham- ,.g, ber is reduced by exhausting the fluid out thrcugh the port 34, and thus the jolt table is permitted to drop by gravity and strike the anvil for eil'ecting the jolting operation to aid in compacting the `molding sand or other material.

rhe internal walls of the cylinder 29 and the walls of the piston I8 -may be conveniently lubricated by supplying oil into the compressed iluid entering through the conduit 31 in any wellknown manner, such, for example, as the manner taught in the Patent 2,456,663. Further, a guide pin or guide pins 5I may be provided for preventing rotation of the table 24 during jolting operation. The pin 5I has its upper end securely connected to the -jolt table 24 and has its remaining portion adapted to reciprocate within a bushing 53 providedin a lateral extension 52 formed integrally with the anvil I2.

In practice prior to Patent No. 2,456,663, jolt machines normally employed a stationary cylinder Vwith a piston secured to the bottom of the jolt table. The piston walls were thus exposed to the atmosphere when the. jolt table was raised, and therefore abrasive dust about the foundry could quickly wear the cylinder and piston. Very Soon, therefore, the jolt table 24 could rock a slight amount with respect to the lower portion of the machine, and then one portion of the jolt table would strike the anvil prior to another portion, resulting in a galloping action. The galloping action will cause a violent side surge of force and hasten further wearing of the piston and cylinder.

Patent 2,456,663 overcame the wear by inverting the cylinder and piston, and making the piston stationary. Thus, the piston is never exposed to the room, and the lower portion of the piston is carried in an oil bath.

This invention is an improvement over Patent No. 2,456,663 in that the jolt piston and cylinder are entirely enclosed within the core I4, with no possibility of room dust causing wear. The principles of Patent 2,456,663 are employed in the construction and operation of piston I5 and cylinder I6, employed for the squeeze operations. This invention is an improvement thereon and provides the combination of the inverted and enclosed pistons and cylinders. Also, the illustrated embodiment provides an improved combination in one machine to produce both a jolt action and a squeeze action. These actions are not separable functions, but are sequential steps lin the production of some types of foundry molds. The device of this invention provides both actions, and provides improved mechanism for producing the actions, in that all moving members are protected against dirt abrasion. Furthermore, the piston I8 is relatively short with respect to the cylinder 29, and the guide bushing 54 is spaced longitudinally from the piston I8. Thus, two spaced points are employed to accurately guide the vertical movement of the rod 22. As will readily be understood, a considerable amount of wear can take place between the piston I8 and the cylinder 29, and also between the guide bushing 54 and the rod 22, before any appreciable amount of galloping action will be possible in the jolt table 24. This improved guiding is provided by the spaced guiding nature of the piston I8 and the guide bushing 54. In addition, the cylinder I6 and the piston Wall I5 provide an Outrigger bearing action which further tends to stabilize the movement of the jolt table 24. In the preferred embodimentillustrated in Figure 1, the piston I 5 and cylinder I6 are employed as the principal guiding means However, it is understood that the cylinder I 6 may be removed in a straight jolt machine, and the improved enclosed piston I8 with the spaced guide bushing 54 will provide accurate jolt movement.

The Figures 2 and 3 of the drawings set forth a modification of the invention with respect to the Figure l. In the Figure 2, a piston II8 is secured to a piston rod |22, and rod |22 is secured to the stationary base of the machine. The table 24 carries a cylinder |29 which is provided with an opening 23 and a packing 3l and guide 54 described in connection with Figure 1 of the drawings.

In Figure 2, exhaust line |33 extends through the longitudinal axis of the piston rod holding the piston |I8 and exhausts into the area inside the outer shell II. Valve rod I 38 is carried by the table 24 and operates to alternately open and close the exhaust line |33 as the table 24 reciprocates in a vertical direction. Fluid under pressure is fed to the chamber defined by the piston I I8 and the table 24 through the system of conduits |31 and control assembly |40 in substantially the same manner as described in connection with Figure 1.

In the embodiment of Figure 2, two spaced pistons I I5 are designed to operate in corresponding cylinders IIB and serve to guide the vertical reciprocation of the table 24. Compression chambers IIB at the top of each of the pistons II5 are supplied with fluid under pressure through line 20 for the purpose of raising the table 24 with a constant pressure for squeezing operations. During jolting movement of the table 24 the chambers IIB are not employed. Further, the plurality of cylinders, each with a separate longitudinal axis, as illustrated in Figure 2, prevents rotational movement of table 24. Thus, a separate anti-rotation device is unnecessary.

In substantially all other respects the modification of Figure 2 is the same as the modication of Figure 1, and provides the spaced guiding action of the piston walls on the piston II8 and the bushing 54. Furthermore, the jolt piston and cylinder I 8 and |29 are combined and are entirely enclosed in this embodiment also in order to prevent the wear of the relatively movable parts by abrasive dust in the room. As set forth with respect to the unit of Figure 1, the unit of Figure 2 is provided with a chamber B on the side of the piston opposite the jolt chamber in order to make the unit serviceable in a roll-over type of machine. A series of connecting conduits I3'IA is provided to conduct the compressed fluid into the chamber B.

Although the invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to Without departing from the spirit and the scope of the invention as hereinafter claimed.

What is claimed is:

l. A molding machine comprising relatively movable portions including a base and a jolt table, a jolt piston and jolt cylinder for raising the table relative to the base, said jolt pieton and jolt cylinder dening a first extensible fluid pressure chamber on one side of the jolt piston, an inlet into said rst extensible chamber for introducing iiuid under pressure into said iirst chamber to raise the jolt table relative to the base, an outlet from said rst extensible chamber through which fluid may be exhausted from said chamber, the ow of fluid into and out of said rst extensible chamber being controllable by the relative movements of the jolt piston and cylinder, said jolt cylinder having internal Walls and end closing means, said jolt piston having side wall surfaces tting complementarly to said internal cylinder Walls, piston rod means of smaller diameter than said jolt piston, said end closing wall means having a guide opening therethrough, said piston rod being dimensioned to fit said opening in fluid sealing relationship, said piston rod being secured on one end thereof to the jolt piston and passing through said guide opening and being secured at the opposite end thereof to one of said relatively movable members, said jolt cylinder being secured to the other of said relatively movable members, said jolt piston and cylinder dening a second extensible chamber between the piston and the end closing means on the opposite side of the piston from said rst extensible chamber, first conduit means connecting the second extensible chamber with a source of controllable-pressure fluid, flowof fluid through said conduit means to the second extensible chamberV thereby being operable independently of vthe relative yposition of the jolt pistonand cylinder means, and Outrigger piston and cylinder means having cooperating wall surfaces laterally spaced from said jolt piston and jolt cylinder, said out-rigger piston and cylinder means defininga third. extensible chamber, second conduit meansconnectingfthe third extensiblechamber with a source ofy controllable-pressure fluid, flow of fluid through said conduit means to the-third extensible chamber thereby being operableindependently of the relative position oi thetable and base, whereby the entire complementary slidingsurfaces oi the jolt piston and cylinder are enclosed and shielded against abrasive room dustand. the jolt table is guided for smooth joltmovement by the laterally spaced guiding action of theoutrigger piston and cylinder means, and guided by the vertically spaced gudingactionof the jolt piston and guide opening.

2. A molding machine unit comprising a base, a jolt-table, first-piston means supported and carriedy by the base and .extending upwardly therefrom toward .the-jolt table, first cylinder means extending downwardly from the table and surrounding the rst piston means, said irst piston means and iirst cylinder means defining extensible rst fluid pressure chamber means, an inlet for introducing fluid under pressure into said rst chamber to raise the table with a steady movement relative to the base, said rst piston having an internal bore defining a second cylinder, end closing means closing said cylinder, a second piston operable in said second cylinder, said second piston having a piston rod extending through the said end closing means and being secured tolsaid table, packing means to prevent the flow of fluid through the said end closing means past the piston rod, said second piston and second cylinder defining a second extensible fluid pressure chamber on the side of said second piston opposite said table, said second piston and second cylinder defining a third extensible fluid pressure chamber on the side of said piston opposite said second extensible fluid pressure chamber, an inlet into said second extensible chamber for introducingv uid under pressure into said second chamber to raise the table relative to the base, an outlet from said second extensible chamber through which fluid may be exhausted from said second chamber for permitting the table to return by gravity, said inlet and outlet being opened and closed by the relativemovements of Athe ysecond piston and cylinder, secondconduit means connecting the third extensible chamber with a source of controllablepressure liuid, iiow of fluidthrough said conduit means to the third extensible chamber thereby being operable independently of the relative position ofthe table Vand base to thereby provide a steady movement of the second piston and the table.V

3. A molding machine unit comprising a base, a jolt table, two spaced pistons supported and cai'- ried by the base and extending upwardly therefrom toward the jolt table, a body structure depending from the bottom of said table and having bores therein deiining two spaced cylinders extending downwardly'from the table and surrounding the two spaced piston means, said two spaced pistons and two spaced cylinders dening rst and second extensible uid pressure chambers, inlet means for introducing uid under pressure into said rst and second extensible chambers to raise the table with a steady movement relative to the base, said body structure depending from the table having an internal bore between said two cylinders defining a third cylinder, a piston operable in said third cylinder, said piston in the third cylinder having a piston rod extending through the end of said third cylinder and being .secured to said base, packing means preventing the'flow of fluid through the end of the third cylinder past the piston rod, said third cylinder andthe piston therein defining a third extensible fluid pressure chamber on the side of said third Vpiston adjacent said table, said third piston and cylinder defining a fourth extensible rluidpressure chamber on the side of said third piston opposite said table, an nlet into said third extensible chamber for introducing fluid under pressure into said chamber to raise the table relative to the base, an outlet from said third extensible chamber through which uid may be exhausted from said third chamber for permitting the table to return by gravity, said inlet and outlet being. opened and closed by the relative movements of the piston and cylinder, conduit means connecting the fourth extensible chamber with a source of controllable-pressure iiuid, iow of iuid through said conduit means to the fourth extensible. chamber thereby being operable independently .ofthe relative position of the table and base.

LESTER C. YOUNG.

No references cited. 

